First quarter adjusted earnings per share was $0.37, down $0.14 from 2011. The results were impacted by the warmest winter on record in Michigan, reducing earnings by $0.13 this year and $0.18 compared to the colder than normal weather a year ago.
The good news is, we've identified a number of actions some of which have already been implemented to offset the adverse weather. Tom will discuss several of these with you later. As a result, we are reaffirming our full year adjusted EPS guidance of $1.52 to $1.55 a share.
On the regulatory side, our electric and gas rate cases are proceeding on schedule. I'll give you an update on these two in a minute. In early April, the Michigan Court of Appeals ruled in a DTE case that the Michigan Public Service Commission lacks statutory authority to adopt a revenue decoupling mechanism for electric utilities. As the result of this decision, we wrote off a $59 million regulatory asset covering the period from December 2009 through November of 2011.
The Court's ruling does not affect our 2012 adjusted earnings guidance since the electric decoupling mechanism was only authorized through November of last year. And I also am going to talk about the bill to raise the retail open assess cap in Michigan and give you an overview on the operations for the quarter.Many of you are familiar with our rate case timeline. We are nearing the deadline for the Commission to issue a final order in our electric rate case. All of the testimony and briefs are filed and the staff in ALG have filed their recommendations. The final order is due no later than June 8. The gas rate case is scheduled for a final order by August 31. Because of the limited size of the case, there's a chance we could settle this case. In March, a bill was introduced to raise the retail open access cap. We are opposed to this bill, which would benefit a relatively small number of business customers at the cost of all other customers. There is wide spread opposition against the bill including the Chair of the Senate Energy and Technology Committee and the Chair of the House Energy and Technology Committee. Read the rest of this transcript for free on seekingalpha.com